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: nesia from these combinations, by the use of 'slaked about saw CARL NVANDEL, OF WALDAU, NEAR BERNBURG, NORTH GERMAN OONFEDERATION, ASSIGNOR TO F. O. MATTHIESSEN AND W. A. WIEGHERS, OF NEW YGRK CITY.

Letters Patent No. 92,405, dated July 6, 1869.

IMPRQVEMENT IN THE MANUFACTURE OI HYDRATE OF MAGNESIA.

W The Schedule referred to in these Letters Patent and making part of the same.

which likewise remains in solution, leaving hydrate of magnesia as a precipitate.

Thus, to carry out the invention, it only necessary to bring sea-water in contact with the caustic lime (slaked lime) or milk of lime, when by the decomposition produced, hydrate of magnesia is precipitated.

This may be done by taking, fo instance, sea water of the Atlantic ocean, which contains nearly one-third To all whom tt may concern:

Be it known that I, CARL WANDEL, of Waldau, near Bernburg, iii the Duchy of Anhalt, North ,German Confederation, have discovered a new and useful Improvement in the Manufacture or Production of Hydrate of Magnesia; and I do hereby declare that the following is a full, clear, and exact description of the same.

Various processes have been employed for producing or obtaining hydrate of magnesia, but it'will suffice to refer to two well-known methods as being more prominent.

The one of these consists in taking carbonate of magnesia and exposing-it to heat, whichexpels the carbonic acid out of the carbonate of magnesia, when hydrate of magnesia remains.

The other method is by decomposing soluble magnesia salts with caustic potassa or caustic soda.

Both of these methods are expensive and otherwise objectionable.

The process, which is the subject of the present invention, obyiates these objections, and is based upon the well-known fact,.that all sea-water contains or has chemically combined with it, a certain percentage of magnesia, in the form of sulphate-of magnesia and chloride or muriate of magnesia.

The invention consists in obtaining hydrate ofmagi its decomposition, one-sixth (k) of one per cent. of Caustic lime, or, in other words, for each one hundred (100) pounds of sea-water using one-sixth (-3,) ofa pound of slaked lime; but these proportions may be more or less varied.

' The lime should be spread out in large flat basins, and the sea-water run over it, and the whole be stirred sixv (6) hours, more or less, until settled, when the clear solution should be run oif and a fresh supply of sea-water adn'iittcd to the basin.

This may be continued for four or six times in suecession,'.until all the caustic lime is combined and washed oil; as chloride of lime and the hydrate of magnesia remains or takes'its place.

The hydrate 'of magnesia thus obtained is then washed with fresh water, dried, and pressed ready for use.

\Vhat ishere claimed, and desired to be secured by Letters Patent, is-

The mamifini-tnre of hydrate of magnesia from sea water, by the use of lime, substantially as described.

CARL 'WANDEL.

lime as a dccomposer, substantially as hereinafter described, the sulphate of magnesia, when brought in contact with milk of lime or lime-water, being decomposed and plaster of Paris formed, which latter remains in solution whilst hydrate of m. gnesia is precipitated, and the chloride or muriate of magnesia (MgOl-FHO) being also decomposed by the lime-water and chloride of calcium or muriatc of lime (Ga-01+HO) formed,

\Vitnesscs:

I-Innny '1. BROWN, J. 0. IDoNNnY.

-) per cent. of magnesia, (MgO+HO,) and using, for

up thoroughly, and allowed to remain for the space of 

